Welcome to the site.
You have a lot of great parts picked out already. You don't need a custom subframe to run any of thew LS based engines. With the help of some motor mount adapters the engine fits like a glove. No cutting needed.
You can have your car mini tubbed for about $1800 - $2200 + the tubs ($350) They say it takes about 60 man hours to install. The shop that did mine took about 40 hours.
A lot of guys are going the LS based engines for different reasons. There extremely reliable, light weight and there computer controlled. Going the LS is much better for a car that sees a lot of driving but you can build a nice SBC for less.
The LS engine requires a computer, you could pin a junk yard harness and ecm for around $800 bucks or like most of the guys here you can spend about $3k for everything ready to plug and play.
Buy yourself a set of ATS spindles for the front, they will allow you to get a big front tire without modifying the frame.
If you don't tub your car your tire width is limited to small. I think volkswagens have wider rear tires than you can in a stock wheel well
The parts you listed are some of the best available. You haven't mentioned a rear end for this car. This combined with your choice of brakes will affect wheel size as well.
Your next move should be either buying a crate LS or SBC engine, getting your rear end figured out and buying your front suspension parts.
Buy your transmission, and bell housing while your at it.
These parts all need to be installed and fit properly prior to taking any further steps. I would find yourself some tires like 315's or 335's and do what it takes to make them fit.
I've been doing all of the above for the past two years and I'm probably 4 months away from completion.
Rich